San Bernardino County follows the California Department of Food and Agriculture's noxious weed list and the California Invasive Plant Council's inventory. Notable invasive species in the region include Saharan mustard, tamarisk (salt cedar), and giant reed (Arundo donax).
California Food and Agricultural Code Division 4 (Pest Control Operations) and the CDFA's noxious weed list regulate prohibited plant species statewide. The California Invasive Plant Council (Cal-IPC) maintains a comprehensive inventory of invasive plants rated as High, Moderate, or Limited threat. In San Bernardino County's desert and mountain ecosystems, particularly problematic species include Saharan mustard (Brassica tournefortii), tamarisk/salt cedar (Tamarix ramosissima), giant reed (Arundo donax), fountain grass (Pennisetum setaceum), and Russian thistle. The county's diverse geography — from desert valleys to mountain forests — means different invasive species affect different areas. San Bernardino County does not maintain a separate prohibited species list beyond state requirements.
Violations of CDFA noxious weed regulations can result in abatement orders and costs. The county may enforce weed abatement for fire hazard reduction under the San Bernardino County Fire Code, with costs billed to property owners.
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